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    <td width="304" height="25" valign="top"><span class="style6">现代工程制图习题及参考答案</span></td>
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    <td width="415" height="30" valign="middle" class="style1 style7">3-8.  画出穿孔四棱锥的左视图，补全俯视图。 </td>
    <td width="369" height="30" valign="middle" class="style3"><span class="style7">3-9. 补画左视图</span>。</td>
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